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The Western States Trail Ride, popularly called The Tevis Cup, is a 100 mile endurance ride. The amateur event has been held annually since 1955. The ride is sanctioned by AERC, the American Endurance Ride Conference which has recognized Tevis as the founding ride of endurance riding. Much of modern endurance is based on the pioneering efforts of the Western States Trail Foundation who is the sponsor of the Tevis Cup ride.

The ride is held in Placer County, California, starting at 5:15 a.m. at Robie Equestrian Park (39°14′20″N120°10′39″W﻿ / ﻿39.23889°N 120.17750°W﻿ / 39.23889; -120.17750) near the town of Truckee, across the crest of the Sierra Nevada near the Squaw Valley Ski Resort, traverses through El Dorado County and ends at 5:15 a.m. near the fairgrounds in Auburn. There are two mandatory 60-minute holds for rest and veterinarian evaluation, one at Robinson Flat (~30 milepost) and the other at Foresthill (~70 milepost). There are many other points along the trail where veterinarians evaluate the condition of the horse including the finish. Each rider who completes the 100-mile course within the 24-hour limit and whose mount is judged "fit to continue" can elect to receive a silver Completion Award Buckle.

Some historical ride statistics as of the 59th ride on August 9, 2014: There have been 9,659 starters and 5,259 finishers, with an overall completion rate of about 54%. The average first-place time is 13 hours and 50 minutes (9:05pm).[citation needed] Winning riders were divided between 30 men and 31 women (counting three years when there were ties). Of the winning horses through 2014, 74% have been geldings, 20% mares, and 6% stallions. The average age of the horse to complete the ride first is 10 years old, with the oldest being Bandos at 16 (1956) and the youngest was Chief at 6 (1962).

In 1964 Paige Harper's horse Keno was the first recipient of the James Ben Ali Haggin Cup, commonly called the Haggin Cup. The first ten riders to finish successfully may present their horse before the Veterinary Committee and the WSTF Cup Committee on Sunday morning. One horse is selected as finishing in the most superior condition. In AERC, weight and ride time contribute to the equivalent called Best Condition. It is believed that the practice of selecting a Best Condition horse began when commanding Officers in the U.S. Cavalry would select a superior mount from their regiment to ride the day after arriving at their destination. In 1989 the WSTF Veterinary Committee with the support of the WSTF Cup Committee did not award the Haggin Cup. 51 years after its inception, the Haggin Cup has been awarded 49 times: 39 geldings (80%), 8 mares (16%) and 2 stallions (4%) through 2014 when Barrak Blakeley's 17 year old Arabian gelding MCM Last Dance won the award (the youngest rider and oldest horse to win the Haggin Cup).

The Josephine Stedem Scripps Foundation Trophy is also presented on behalf of the ride in honor of all juniors that complete the challenge. It was first presented in 1994 by Roxanne Greene, who donated the Cup, and her daughter Rebecca Greene, the youngest rider ever to win ten Tevis buckles. Some riders were not recorded as junior participants in the early years and still need to be identified as such. Wendell Robie who founded the ride, set the rule that riders must be at least twelve years of age to enter and would be considered a junior rider until the age of eighteen.

The 54th Tevis Cup was originally scheduled for Saturday, July 19, 2008. However, on July 9th that year the Western States Trail Foundation and the US Forest Service held a meeting and agreed that the ride should be cancelled due to the American River Complex wildfires (part of the Summer 2008 California wildfires) that began burning in the area around June 21, 2008.

The 54th Tevis Cup occurred on Saturday, August 1, 2009. A total of 169 riders started from Robie Equestrian Park. There were six "junior" riders to start and four that finished. A total of 82 horses were "pulled" at various vet-checks along the Western States Trail by the team of expert equestrian veterinarians. The weather was much cooler than average, so this was favorable for the horses and riders alike. A website blog by Karen Chaton kept everyone informed of the progress throughout the 100-miles. For the first time in Tevis history, videos taken from the saddle were uploaded onto YouTube and timely updates were shared using Twitter. The first rider to finish and winner of the 2009 Tevis Cup was Sarah Engsberg from Georgia riding K-Zar Emmanuel, a 15-year old gray Arabian gelding. They crossed the finish line in Auburn at 10:20 p.m. Eleven minutes later the second horse was, LD Monique ridden by Melissa Ribley, DVM. The third horse arrived at 10:32 p.m.; AM Sands of Time, with Marcia Smith, DVM guiding her. The ride ended at 5:15 a.m. on August 2, and 87 riders (~51%) successfully completed. On Sunday morning, August 2, the "Top-Ten" horses to finish were presented for the Haggin Cup. The 2009 Haggin Cup for "best condition" was awarded to LD Monique and Melissa Ribley.

In 2011 heavy snow in the Sierra Nevada Mountains throughout the preceding winter were failing to melt from the upper portions of the trail. This forced officials to reschedule the ride to the next permissible date which was October 8th. Two days before the ride a sudden snow storm again hit hard in the mountains rendering the starting location inaccessible and causing officials to revise the course. 177 entrants started the ride; 10 of them coming from outside of the United States. The 56th annual ride began in Auburn, traversed up to Foresthill and branched out to a turn-around point at the end of Gorman Ranch Road then back to Foresthill and finished in Auburn. The completion rate was nearly 70%. 2004 and 2007 winner, Jeremy Reynolds riding Riverwatch, was credited with the fastest time for this course earning his third Tevis Cup. He also repeated a win of the Haggin Cup which he previously captured in 2004 riding CV Eli when he tied for first place with Becky Spencer atop Oritos Sonny.

The 58th annual ride was on July 20th, 2013. 160 horses started and 75 successfully finished for a 47% completion rate. Rusty Toth of Durango Colorado, the previous year's Haggin Cup winner, was the first rider to complete the ride at 10:12 p.m. aboard an eight year old Arabian gelding named Take A Break "Quake". The 8th place horse and rider team of twelve year old gelding LZP Julicslastchance "Julio" and Suzanne Hedgecock, finishing roughly two hours later, would be the eventual winner of the Haggin Cup. Results of all years are available at www.teviscup.org including the 2013 ride.

The 2014 ride was held on August 9, 2014, won by Heather Reynolds, riding a 14 year old Arabian gelding, earning her second Tevis Cup victory. The Haggin Cup was awarded to MCM Last Dance, a 17 year old Arabian gelding, ridden by a Junior rider Barrak Blakeley from Terrebonne, Oregon. Barbara White earned her 33rd Tevis buckle, and she remains the all-time leader for successful completions of the 100-mile ride. Hal Hall closely follows behind having earned his 30th Tevis buckle in 2013. Danny Grant of New Westminster, Canada received his One-Thousand Mile buckle while Patricia Chappell earned her Two-Thousand Mile buckle for 20 completions. There were 186 starters and 107 finishing for a 57.5% completion rate partially attributed to favorable weather conditions. 10 of 16 riders from 12 countries outside of the U.S. completed. Additionally, 4 of 7 Juniors finished the ride.

The date of the ride is generally selected on a weekend in July or early August to best take advantage of the light from a full moon. The 60th annual ride is scheduled to be held on August 1st, 2015.